Question

Which physical change is endothermic?

Answer 1

Physical change of a substance involves the change in phase or state. The physical change which is endothermic is, conversion of solid carbon to gaseous carbon.

What is endothermic reaction?

Endothermic reactions are those which absorbs heat energy to give the products. Thus heat is taken into the reaction system hence the name endothermic.

In exothermic reactions, the heat energy is released by the reaction system, where the heat is exiting hence the name exothermic.

When solids changes to gaseous state, the tightly packed molecules in the solid state requires much energy to move apart and to overcome the intermolecular forces of attraction.

Liquid to gas does not require these much energy and gas to liquid evolves energy out.  Therefore, the physical change given here which is  endothermic is conversion of solid carbon dioxide to gas carbon dioxide.

Hence, option D is correct.

To learn more about endothermic reactions, find the link below:

brainly.com/question/23184814

#SPJ1